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With this carbon dioxide diffuser, you can connect your CO2 line to your canister filter return line to be circulated gently into a plant friendly aquarium. Fits ½" filter tubing and standard ¼" airline tubing.
| Size | Fits Filter Tubing | Fits Airline Tubing | Diffuser Body Length |
| 12mm | 1/2" (12mm) | 1/4" (6mm) | 4.5" |
| 16mm | 5/8" (16mm) | 1/4" (6mm) | 5.5" |
